Diminishing food and water security and ruinous sea level rise are the leading climate change concerns of a section of the American electorate that is aghast at the lack of discussion of global warming during the presidential debate. A Guardian US survey of its readers found that pressure on food and water supplies is considered the most important consequence of climate change. Sea level rise, which is set to inundate coastal areas currently occupied by millions of Americans, is second on the list of the most urgent issues.